Answer:
casey's will beep at 5:45 and her brothers at 5:40
Step-by-step explanation:
its because you have all the numbers add the wach time to the clock and theres ur answer! hope i helped!
6:00
her bro beep every 10 min
casey beep every 15 min
15 +15 = 30
10 + 10 +10 is 30
so yea
